Tire-building apparatus



April 24,192a. 1,661,2 3

- 3. L. MATHER TIRE BUILDING APRARATus Filed May 15, 1922 2 sneeta saim 2 GEORGE 1'... Y IA THEFP l/VVEN TO-F? 4T TOP/VIE Y Patented Apr. 24, 192$ UNITED STATES PATENT OFFICE.

GEORGE L. MATHER, F MILWAUKEE, WISCONSIN, ASSIGNGR TO THE FISK RUBBER GOMPANY, GI! CHIGOPEE FAL'LS, MASSACHUSETTS, A CORPORATION OF MASSA- GHUSETTB.

Application filed May 15,

panyingthis specification and forming a part thereof I have shown, for purposes of illustration, one form which my invention may assume. In these drawings:

Figure 1 shows a carcass, lying flat upon the'pulley, I Figure 2 shows the carcass partially expanded, while a FigureB shows the carcass expanded.

v In El ure 1 the carcass ll'isshown as-a flat ban lying on the pulley 12and ready to be e'xpandedinto toric shape. One'edge of the carcass 11 is shown as engaging an annular packing 13 secured to a'ring 14 uni tary with the pulley 12 while the other edge of'the carcass -11 is shown as engaging a similar packing 15 secured to a similar ring 16 movable across the face of the pulley 12. Thecarcassll is held in close engagement with the packings 13 and 15 by a' plurality ofstraps 17 extending between hooks 18 on the rin "14: and hooks 19 on the ring 16.

* Similar y, atight oint is produced between the ring 16 and t e pulley 12 first by the close fit of the ring and pulley themselves andsecond by the packing rings 20 and 21 'recesseol' into the face of the pulley 12 and so positioned that at least one is always in- 'engagement with the ring 16 as it is moved across the face of the pulley 12. The pulley 12 is also provided with a duct 22 adapted to'be connected to any suitable source of,

, fluid pressure and opening into the space between the pulley 12 and the carcass 11.

In operation, afterthe carcass has been assembled on the pulley and the straps positioned -as shown in Figure 1, fluid is introduced through the duct 22. in the absence oi? the inentensible straps 17 this fluid would niove the carcass 11 away from the packings 15 and escape but the straps 1'? pre "vent this escape and the confined fluid is thus forced to exert pressure against the entire inner surface of the carcass 11 and his manner to expand the carcass 11 y from the drum shown in Figure 2 which figure also illustrates how the straps '1' continue to hold the edges of the carcass 'ta-zwainstthe packings and 15 TIRE BUILDING APPARATUS.

1922. Serial No. 560,882.

the ring 16 to slide across the face of the pulley 12 to keep the packing l3 continually eneath the edge of the carcass 11. The introduction of fluid is continued until the carcass 11 finally assumes the substantially toric shape shown in Figure 3.

It will be apparent from the above description that I have invented certain improvements in building by the herein considered method.- This disclosure is, however, illustrative only and my invention is not limited thereto.

Iclaim:

1. A pulley adapted to support a tire carcass and'provided with means adapted to seal the edges of the carcass to the pulley.

2. A pulley adapted-to support a carcass,

a ring freely slidable across the face of the pulley and engaging one edge of the carcass,

a fixed abutment on the pulley engaging the other edge of the carcass and means for introducing air directly between the pulley and the carcass.

'3. A pulley adapted to support a carcass, a ring freely slidable across theface of the pulley and in fluid tight contact therewith;

and inextensible means connecting said ring with points in fixed relation with said pulley.

4. A 'ulley ada ted to support a carcass, a ring reely slida le across the face of the pulley, means to maintain the ed es of said carcass respectively in fluid ti'g t contact with said ring and said 'pulley and means for introducing fluid ressure directly between the pulley and tiie carcass.

5.- A pul ey adapted to support a carcass, ring slidable across the face of the pulley, and inextensible means connecting said ring with points in fined relation with said pulley.

6. Apulley adapted to support a carcass, and means associated with the pulley and in engagement with the edges of thecarcass to form a fluid tight chamber between the carcass and the'pulley.

Z. A pulley adapted to support a carcass,

ineansadapted to seal the edges of the carcuss to the pulley and means to admit fluid pressure between the carcass and pulley.

8.- A method. of forming and stretching a tire carcass, consisting of building the carcass flat upon circular drum, holding one edge only of the carcass to the drum, 'expanding the ce i portion of the carcass oniy in circus. tiai direction the eat" pension of the carcass centrally moving the memes carcass across the drum to one side thereof. 9. A method 0t forming and stretchlng a. tire carcass, consisting of building it carcass fiat upon a circular drum, holding one edge only of the carcass to the drum, expandmg the carcass centrally so edge movesover beyond that the opposite the center of the drum towards the held edge, and the completed expanded tire occu eral edge of the drum,

pylng one periph- 10. The method of forming and stretch.

sconce n m'rrmn. 

